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Summary:

The Gorgons Sthenno and Euryale find the infant Medusa on their shore; they decide to raise her, and learn to care for her. Medusa is curious about humans and when she is sixteen, her sisters allow her to visit one of their temples. Poseidon is there, and he offers Medusa an impossible choice. 

Meanwhile, the goddess Athene is born, fully-formed, from her father Zeus's head. 

Summary: 

Danaë and her baby Perseus, the son of Zeus, wash up on the shore of Seriphos after being imprisoned by Danaë's father, King Acrisius. They are discovered and cared for by Dictys, the self-exiled brother of King Polydectes. Perseus grows and learns to fish alongside Dictys. When Perseus is 16, King Polydectes visits and sets him a task: if Perseus doesn't bring Polydectes the head of a Gorgon within two months, Polydectes will marry Danaë and take her to his palace.

Meanwhile, the Olympians (and Heracles) defeat the Giants in a bloody slaughter. Athene skins one of the Giants and has Hephaestus make her a breastplate from the hide. She remembers Poseidon has insulted her by raping Medusa in her temple and because she cannot punish Poseidon, she punishes Medusa instead.

Summary:

Hephaestus makes Athene a lifelike statue of her pet owl, and Athene curses Medusa: she now has snakes instead of hair, like her sisters, and a terrible pain in her eyes. Sthenno and Euryale try to comfort and help Medusa, but she keeps her eyes blindfolded to try to ease the pain. Gradually, Medusa leaves the cave and comes to realise that her gaze now turns living creatures to stone. 

Meanwhile, Hermes and Athene help Perseus on his quest to find a Gorgon's head. They take him to the Graiai, whom he tricks for more information, and the Hesperides, who give him a sword, a bag, and Hades' cap of invisibility. Hermes also lends Perseus his winged sandals. 

Cassiope, queen of Ethiopia, claims that she and her daughter Andromeda are more beautiful than the Nereids. The Nereids vow to persuade Poseidon to punish her.

Athene rejects Hephaestus's advances, and he ejaculates onto her. Gaia nurtures Hephaestus's discarded semen and gives the baby to Athene, who in turn gives it to the daughters of Cecrops to guard. 

Summary:

The fruits of the olive tree relate the story of the contest between Poseidon and Athene for the patronage of Athens, which was eventually decided by Athene's son, Erichthonius, in her favour. 

While Poseidon sulks, Amphitrite convinces him to punish Cassiope for saying that she and her daughter were more beautiful than all the Nereids. Poseidon floods Ethiopia. Cassiope eventually admits her crime and offers herself for sacrifice, but the priests have Andromeda in mind.

Euryale wants Medusa to experiment with her new power, but Medusa is terrified of harming her sisters or any other living creature. 

Perseus feels wholly unsuited for his task. He admits that he doesn't even know what a Gorgon looks like; Hermes and Athene reluctantly explain and give him more advice. 

Medusa's snakes recall how Athene tricked Sthenno and Euryale, and how Perseus managed to sneak up on Medusa. They blame themselves for what happened.

Summary: 

Sthenno and Euryale discover Medusa's body. Perseus takes her head, the Gorgoneion, and flees. Inspired by the sound of the Gorgons' grief, Athene invents the flute. 

Perseus travels to Atlas's kingdom, where he uses the Gorgoneion to kill a shepherd and Atlas himself. Atlas, a Titan, creates a mountain when he is turned to stone. Perseus then reaches Ethiopia, where he uses the Gorgoneion to kill the sea-monster that Poseidon sent to kill Andromeda. Perseus releases Andromeda; she decides to marry him, but her parents have reservations. 

Perseus returns to Seriphos in time to prevent his mother's wedding, and uses the Gorgoneion to kill Polydectes. 

Back in Ethiopia, Andromeda's uncle/former fiancé attacks the wedding celebrations. Perseus wields the Gorgoneion and kills many people, on both sides. He doesn't understand why Andromeda isn't happy.

Zeus tells Athene to take the Gorgoneion from Perseus. She attaches it to her aegis and accidentally turns one of her priestesses to stone. Centuries later, Athene tells the Gorgoneion that she is homesick. The Gorgoneion offers to help.